Image Example?Hey I was wondering If I have a graph that contains cycles. How can I break it into all possible Trees?? (Assuming the no. of vertices are very less?)

Almost after every contest I always feel like I underperformed while up solving the problems. Are there any general tips for being “contest-ready” that have worked out for you guys? One thing that has kinda helped me in sleeping before the contest for like an hour but still I feel I couldn’t give it my all :(

Recently I started solving harder problems on At-Coder, USACO, Hacker-Earth etc. A lot of times I find myself spending excessive amount of time trying to understand these editorials. A lot of small points (even though they are critical in laying the base for understanding the problem) are usually completely disregarded. Due to this it becomes rather difficult to understand the latter part of the solution. How do you guys deal with this problem (if you face it)?

I recently faced an issue due the fact that I didn't placed an 'int' before the looping for a vector that was constructed. It works without (int) sometimes but this time It gave warnings. Can someone explain this behavior. Thankyou.